Two Charged parallel plates are 1.5 cm apart. The magnitude of the electric field between the plates is 1800 N/C. What is the electric potential difference between
the plates? How much work is required to move a proton from the negative plate to
the positive plate?

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

if you know your abc's you should be able to get your answer or just use google